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Vanadium mining, 1940s. Buildings of the US Vanadium Corporation with a smelter stack at left. This factory and mine is near State Route 160, Durango, La Plata County, Colorado, USA. Vanadium is a transition metal obtained from its ores. Typical uses include vanadium-steel alloys. This photograph, dating from 1942, forms part of the Historic American Engineering Record.
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